* Under the hood: This is where you'll likely find the main engine control module (ECM) and possibly other modules related to engine functions. It's usually a fairly large, black box.
* Under the dashboard: Several modules controlling things like the anti-lock brakes (ABS), body control module (BCM), and climate control are often located under the dashboard. Accessing these usually requires removing parts of the dash.
* Other locations: Smaller modules might be located near their associated components (e.g., a module for the power seats near the seats themselves).
To find a specific module, you'd need a wiring diagram for your specific year and model Malibu. These diagrams show the location of each component and its connections. You can often find these online through automotive repair websites or forums.